Beginner's questions about PoE Currency

Hi, I started my adventure with the Path of Exile with the beginning of the Synthesis League. Earlier I played in D3, but also other older MMOs.
I understand already which orbs that have properties, I know not to use currency at the very beginning of the game (because orbs will be useful later, when I get really good items).
I have already created 3 characters
85 LVL
43 lvl
and 23lvl

However, I am concerned about one thing and hence my question, it is possible that I am doing something differently than I should. So far, I’ve found only 1 exalted orb. A dozen or so Chaos orbs and other cheaper orbs, but it is Exalted orb that is supposed to be the most reliable currency. What can I do to drop more and more valuable orbs?